The ArchLookupSwitch implementation has been completely replaced by
ArchBinarySearchSwitch, leaving dead code behind.

Change-Id: I7fd6306cb0f5562c10e32293f5ea13bbd3bf7067
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2077684
Commit-Queue: Rodolph Perfetta <rodolph.perfetta@arm.com>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66501}